How does the Activity Cap work in Flex?

The activity cap is simply the maximum number of students who can be in a Flex activity. It is set by the teacher who owns the activity — not by an administrator or by any access-control setting.

How the cap is set

• The teacher sets the cap. When a teacher creates or edits an activity, they choose its maximum number of students. That number is the activity cap.
• Mandated activities: If an activity is mandated (students are required to attend), the number of students mandated is the activity cap. The mandate fills the seats.

Multiple activities in the same room

If a teacher runs more than one activity in the same room during the same Flex period, the system watches the choice sign-ups across those activities so the room capacity is respected. In other words, the individual activity caps still apply, and the system also makes sure the combined sign-ups don't exceed how many students the room can hold.

Not the same as a Controlled Access Period (CAP)

The activity cap has nothing to do with a "Controlled Access Period." It is only the seat limit on an activity. Don't confuse the activity cap with access-control or group-permission settings on a Flex period.

Source: Securly Flex subject-matter expert (implementation team). Related reading: "Understanding Attendee Max Cap Exceedances in Activities" explains why a cap can occasionally be exceeded (simultaneous choice sign-ups, or the Plus Add feature).